Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-1717-C7-1722
Interface studies in a Ti-6Al-4V/sigma fiber compositeD. UPADHYAYA1, M.A. BAKER2, C.M. WARD-CLOSE3, P. TSAKIROPOULOS2 and F.H. FROES1
1 Institute for Materials and Advanced Processes, University of Idaho, Moscow, ID 83843, U.S.A.
2 Department of Materials Science and Engineering, University of Surrey, Guildford, Surrey GU2 5XH, U.K.
3 Materials and Structures Dept. DRA Farnborough, Hants GU14 6TD, U.K.
The paper reports results from an on going study of the interfaces in diffusion bonded Ti-GAl-4V/Sigma composites. This paper concentrates on the analysis of a composite in the as-received condition using Auger electron spectroscopy (AES) and scanning electron microscopy (SEM). The SiC based Sigma fiber has a tungsten core and a duplex coating of carbon (adjacent to the SiC deposit) and TiBx. It is shown that boron from the TiBx layer diffused into the matrix and formed TiB needles. Carbon was detected in the TiBx layer. Analysis of in-situ fracture surfaces has shown that the failure was initiated either within the carbon layers or at the TiBx-matrix interface. The oxygen detected at the TiBx-matrix interface influenced the fracture behavior of the composite.
© EDP Sciences 1993